#ifndef _STEMDB_H_INCLUDED_
#define _STEMDB_H_INCLUDED_
/* @(#$Id: stemdb.h,v 1.2 2006-11-15 14:57:53 dockes Exp $  (C) 2004 J.F.Dockes */
/// Stem database code
/// 
/// Stem databases list stems and the set of index terms they expand to. They 
/// are computed from index data by stemming each term and regrouping those 
/// that stem to the same value.
/// Stem databases are stored as separate xapian databases (used as an 
/// Isam method), in subdirectories of the index.

#include <list>
#include <string>

#include <xapian.h>
#ifndef NO_NAMESPACES
using std::string;
using std::list;
namespace Rcl {
namespace StemDb {
#endif // NO_NAMESPACES

/// Get languages of existing stem databases
extern std::list<std::string> getLangs(const std::string& dbdir);
/// Delete stem database for given language
extern bool deleteDb(const std::string& dbdir, const std::string& lang);
/// Create stem database for given language
extern bool createDb(Xapian::Database& xdb, 
		     const std::string& dbdir, const std::string& lang);
/// Expand term to stem siblings
extern std::list<std::string> stemExpand(const std::string& dbdir, 
					 const std::string& lang,
					 const std::string& term);

#ifndef NO_NAMESPACES
}
}
#endif // NO_NAMESPACES

#endif /* _STEMDB_H_INCLUDED_ */